microsoft/DirectXShaderCompiler

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This repo hosts the source for the DirectX Shader Compiler which is based on LLVM/Clang.

Stars: 3.7k
Forks: 900
Open beginner issues: 6
Indexed issues: 641
Avg merge: 2d 11h
Merged PRs (30d): 44

Dominant language: C++
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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641 open issues indexed

[Debug info] Base sub-object of a derived variable is described with an empty `!DIExpression()` Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/DirectXShaderCompiler#8751 · Opened Aug 10, 2026
[Feature Request][Debug info] Globals lowered to `global.<name>` locals should link to their declaring scope Open

enhancement needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8750 · Opened Aug 10, 2026
[Debug info] Unbounded resource array is described as `DISubrange(count: 1)` Open

bug needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 58/100

microsoft/DirectXShaderCompiler#8748 · Opened Aug 10, 2026
[Debug info] Only the first four elements of a matrix loaded from a buffer get debug values Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/DirectXShaderCompiler#8747 · Opened Aug 10, 2026
[Debug info] `discard` has slightly wrong debug location Open

bug needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 55/100

microsoft/DirectXShaderCompiler#8746 · Opened Aug 10, 2026
Point Release 1.10.2605 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/DirectXShaderCompiler#8741 · 1 comment · Opened Aug 6, 2026
[SPIR-V] DXC SPIR-V test fail with the latest spir-v tools Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8740 · 3 comments · Opened Aug 6, 2026
Atomics on RWTexture2DMS result in silent UB or ICE Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8737 · 3 comments · Opened Aug 4, 2026
[SPIR-V] SPV_EXT_descriptor_heap mixed bound/heap aliasing causes silent miscompilation or ICE Open

bug spirv

microsoft/DirectXShaderCompiler#8732 · 1 assignee · Opened Aug 4, 2026
[HLSL] LinAlg HLK: Add tolerance and ULP comparison modes to the matrix oracle Open

microsoft/DirectXShaderCompiler#8729 · 1 assignee · Opened Aug 3, 2026
[HLSL] LinAlg HLK: Use a checked-arithmetic type for oracle size computations Open

microsoft/DirectXShaderCompiler#8728 · 1 assignee · Opened Aug 3, 2026
[HLSL] LinAlg HLK: Template the CPU oracle end to end Open

microsoft/DirectXShaderCompiler#8727 · 1 assignee · Opened Aug 3, 2026
[SER] Passing a payload by value to HitObject::Invoke asserts in CodeGen Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8725 · Opened Jul 31, 2026
LinAlg HLK: Add bfloat16 coverage once DXIL gains a bfloat16 ComponentType Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/DirectXShaderCompiler#8720 · Opened Jul 30, 2026
[SPIR-V] Stage input variables optimized away despite -fspv-preserve-interface Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8716 · Opened Jul 30, 2026
[SPIR-V] `SPV_EXT_descriptor_heap`: acceleration structure heap stride computed before codegen causes false rejections and over-wide strides Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/DirectXShaderCompiler#8714 · Opened Jul 29, 2026
LinAlg HLK: Finalize test identity and metadata Open

microsoft/DirectXShaderCompiler#8696 · 1 assignee · Opened Jul 27, 2026
LinAlg HLK: Add OuterProduct and VectorAccumulate coverage Open

microsoft/DirectXShaderCompiler#8694 · 1 assignee · Opened Jul 27, 2026
LinAlg HLK: Add MatVec interpretation and bias coverage Open

microsoft/DirectXShaderCompiler#8691 · 1 assignee · Opened Jul 27, 2026
[linalg] Move `__builtin_LinAlg_*` intrinsics under `DxIntrinsics` Open

microsoft/DirectXShaderCompiler#8680 · 1 assignee · Opened Jul 27, 2026
Standardize #line handling in dxcompiler Open

bug needs-triage

Difficulty 5/5 Over a week Newbie friendliness 45/100

microsoft/DirectXShaderCompiler#8679 · 1 comment · Opened Jul 27, 2026
Remove local D3D12_FEATURE_D3D12_OPTIONS_PREVIEW fallback once GroupSharedLimit ships in a released Windows SDK Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

microsoft/DirectXShaderCompiler#8661 · Opened Jul 23, 2026
LinAlg HLK: Qualify the suite on WARP and representative third-party implementations Open

microsoft/DirectXShaderCompiler#8657 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Integrate LinAlg coverage into the existing DXIL HLK pipeline Open

microsoft/DirectXShaderCompiler#8656 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Finalize stable test identity and requirement metadata Open

microsoft/DirectXShaderCompiler#8655 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add atomic accumulation collision and concurrency coverage Open

microsoft/DirectXShaderCompiler#8654 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add conversion, interpretation, signedness and saturation coverage Open

microsoft/DirectXShaderCompiler#8653 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add Thread, Wave and ThreadGroup execution coverage Open

microsoft/DirectXShaderCompiler#8652 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add layout, offset, stride, alignment and bounds coverage Open

microsoft/DirectXShaderCompiler#8651 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add component-type and value-domain coverage Open

microsoft/DirectXShaderCompiler#8650 · 1 assignee · Opened Jul 22, 2026
LinAlg HLK: Add dimension, shape and boundary coverage Open

microsoft/DirectXShaderCompiler#8648 · 1 assignee · Opened Jul 22, 2026
[SPIR-V] RWByteAddressBuffer.Store<uint16_t> lowers to a non-atomic 32-bit read-modify-write, racing adjacent 16-bit stores (DXIL emits a native 16-bit store) Open

bug needs-triage spirv

microsoft/DirectXShaderCompiler#8646 · 2 comments · 1 assignee · Opened Jul 22, 2026
[SPIR-V] Dynamic resources use phi node of resource pointer without specifying capability Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/DirectXShaderCompiler#8642 · Opened Jul 21, 2026
Linear Algebra Implementation Open

microsoft/DirectXShaderCompiler#8640 · 1 assignee · Opened Jul 21, 2026
[SPIR-V] `uint64_t2/int64_t2` typed buffers emitted with `Unknown` image format Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8615 · Opened Jul 10, 2026
Enable SPIRV on ALL DXC Release Builds Open

enhancement needs-triage spirv

microsoft/DirectXShaderCompiler#8614 · 1 reaction · 1 assignee · Opened Jul 9, 2026
[SPIR-V] Validation Error: ID decorated with RelaxedPrecision multiple times is not allowed. Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8609 · 2 reactions · Opened Jul 8, 2026
Incorrect application of semantic interpolation modifiers Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8596 · Opened Jun 29, 2026
dxil missing inlineAt in debug info for sampler annotations Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8592 · Opened Jun 25, 2026
Some SM69 Vectorized QuadRead and other tests fail on x86 WARP Open

bug needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8591 · Opened Jun 25, 2026
[Crash] VariablePointers* capabilities not enabled when targeting SPIRV backend Open

spirv

Difficulty 3/5 1-2 days Newbie friendliness 55/100

microsoft/DirectXShaderCompiler#8581 · 1 comment · 1 reaction · Opened Jun 22, 2026
[Crash] Assertion failure assigning resource to static local resource Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8580 · Opened Jun 22, 2026
[Crash + miscompile] (cond ? a : b) = expr; with HLSL resource types asserts in debug, silently drops in release Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8579 · Opened Jun 22, 2026
[Feature Request] Vulkan SPIR-V Extensions support? Open

enhancement needs-triage spirv

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/DirectXShaderCompiler#8578 · Opened Jun 22, 2026
Miscompile when reading matrix from a structure in a ByteAddressBuffer Open

bug needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/DirectXShaderCompiler#8569 · Opened Jun 19, 2026
[SPIR-V] Generated SPIR-V debug information makes RenderDoc to crash Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/DirectXShaderCompiler#8566 · 1 comment · Opened Jun 18, 2026
LinAlg Validation: RDAT/PSV0 Open

microsoft/DirectXShaderCompiler#8544 · 1 assignee · Opened Jun 17, 2026
[SPIR-V] fatal error: generated SPIR-V is invalid: NonSemantic.Shader.DebugInfo.100 DebugTypeMember: operand Column End (171) is larger then Line 475 column length of 23 found in the DebugSource text Open

bug needs-triage spirv

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/DirectXShaderCompiler#8543 · 5 comments · 3 reactions · Opened Jun 17, 2026
[Feature Request] firstbitlow for uint64_t Open

enhancement needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/DirectXShaderCompiler#8536 · 1 comment · Opened Jun 16, 2026
[Feature Request] Separate compiler flags to disable/enable associative expression rewriting and other FP optimizations Open

enhancement needs-triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/DirectXShaderCompiler#8530 · Opened Jun 9, 2026

microsoft/DirectXShaderCompiler

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